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Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquid

A technology of sodium bicarbonate and sodium carbonate, applied in the directions of alkali metal chlorides, alkali metal carbonates, chemical instruments and methods, etc., can solve the problem of low recovery rate of condensed water, low utilization of condensed water, impact on production costs of enterprises, and complex components of trona. and other problems, to achieve relatively high profits, significant economic and environmental benefits, and reliable methods.

Pending Publication Date: 2020-02-07
TIANJIN UNIVERSITY OF TECHNOLOGY +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional process of trona production adopts multi-effect evaporation soda production process, the energy consumption of evaporation is high, and the recovery rate of condensed water is low; at the same time, due to the complex composition of trona, the trona solution obtained by water mining (main component It is sodium carbonate, sodium bicarbonate and sodium chloride, commonly known as raw halogen, natural lye), after evaporation to make alkali, a large amount of high-salt wastewater is discharged (sodium chloride content is 80-230g / L, sodium carbonate, bicarbonate The total sodium content (calculated as equivalent to sodium carbonate) is about 200-450g / L)
Most of this part of high-salt wastewater is currently used by enterprises to inject and mine natural lye, but this will cause the quality of alkali ore to decline continuously, and the cost of alkali production will continue to increase; the cost of disposal of this part of saline wastewater is extremely high, which seriously affects Enterprise production costs, and will bring a huge burden to the environment

Method used

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  • Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquid
  • Method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkali liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] 10,000L of mined natural lye (contains 100g / L sodium carbonate, 95g / L sodium bicarbonate, 10g / L sodium chloride, and 925g / L water) is filtered and removed, and then sent to the steam machine for further processing. Compression evaporation device 1, (the device is equipped with a centrifugal steam compressor, which can realize the low-temperature evaporation of natural lye and at the same time evaporate the saturated water vapor to be used for the evaporation of natural lye after compression and heating), evaporated at 96 ° C Saturated water vapor is recompressed and heated to 106°C for trona evaporation, and at the same time, the first solid-liquid mixture and condensed distilled water 6500L are obtained. The distilled water is used for trona injection and production, and non-condensable water vapor is discharged;

[0066] After the first solid-liquid mixture is cooled, enter the first solid-liquid separation device 2 for solid-liquid separation to obtain mixed alkali of...

Embodiment 2

[0073] 10,000L of mined natural lye (tested to contain 120g / L sodium carbonate, 85g / L sodium bicarbonate, 15g / L sodium chloride, and 920g / L water) is filtered and removed, and then transported to the steam machinery Compression evaporation device 1, (the device is equipped with a centrifugal steam compressor, which can realize the low-temperature evaporation of natural lye and at the same time evaporate the saturated water vapor to be used for the evaporation of natural lye after compression and heating), evaporated at 94 ° C Saturated water vapor is recompressed and heated to 105°C for trona evaporation, and the first solid-liquid mixture and condensed distilled water 6100L are obtained at the same time. The distilled water is used for trona injection and recovery, and non-condensable water vapor is discharged;

[0074] After the first solid-liquid mixture is cooled, it is passed into the first solid-liquid separation device 2 for solid-liquid separation to obtain mixed alkali...

Embodiment 3

[0081] 10,000L of mined natural lye (tested to contain sodium carbonate 80g / L, sodium bicarbonate 115g / L, sodium chloride 20g / L, and other components are water 950g / L) is filtered and removed, and then transported to the steam machine for further processing. Compression evaporation device 1, (the device is equipped with a Roots-type steam compressor, which can realize the low-temperature evaporation of natural lye and at the same time evaporate the saturated water vapor to be used for the evaporation of natural lye after compression and heating), evaporate at 96°C to obtain The saturated water vapor was recompressed and heated to 103°C for trona evaporation, and at the same time, the first solid-liquid mixture and 6230kg of distilled water were obtained, and the distilled water was used for injection and production of trona;

[0082] After the first solid-liquid mixture is cooled, it is passed into the first solid-liquid separation device 2 for solid-liquid separation to obtain...

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Abstract

The invention relates to the technical field of clean production, and provides a method and system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural alkaliliquid. According to the method provided by the invention, a steam mechanical recompression technology is adopted to replace a multi-effect evaporation technology in a traditional method, and a cyclicutilization flow of waste gas and wastewater is designed, so that CO2 discharged in the process can be fully recycled for saline-alkali separation, and by-product sodium bicarbonate and sodium chloride products are obtained, and meanwhile, the problem of discharge of a large amount of high-salinity water is solved. The method provided by the invention is reliable and reasonable in design, can realize all-component recycling in trona production at low cost, realizes multiple effects of energy conservation, emission reduction, synergy and clean production, has demonstration significance for thealkali nitrate industry, and has remarkable economic and environmental benefits; the system provided by the invention is low in operation cost, low in energy consumption, small in device investment and easy to industrialize.

Description

technical field [0001] The invention relates to the technical field of clean production, in particular to a method and a system for producing sodium carbonate, sodium bicarbonate and sodium chloride by evaporating natural lye. Background technique [0002] The traditional process of trona production adopts multi-effect evaporation soda production process, the energy consumption of evaporation is high, and the recovery rate of condensed water is low; at the same time, due to the complex composition of trona, the trona solution (main component It is sodium carbonate, sodium bicarbonate and sodium chloride, commonly known as raw halogen, natural lye), after evaporation to make alkali, a large amount of high-salt waste water is discharged (sodium chloride content is 80-230g / L, sodium carbonate, bicarbonate The total sodium content (calculated as equivalent to sodium carbonate) is about 200-450g / L). Most of this part of high-salt wastewater is currently used by enterprises to in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D7/00
CPCC01D3/06C01D7/00
Inventor 李梅彤张柯殷守彪张又天袁文蛟范文浩
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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